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A273393 as a simple table

na(n)
01
15
221
381
4293
51237
65685
726093
8108421
9432245
101706365
116761333
1226898301
13107280245
14428476285
151712596853

[1,5,21,81,293,1237,5685,26093,108421,432245,
 1706365,6761333,26898301,107280245,428476285,
 1712596853]